64-Pitch 31T Ultra-Hard Pinion Gear for Motor Replacement - Yokomo YOKPG6431  [YOKPG6431]

Engineered 64-Pitch 31T Pinion

This Yokomo YOKPG6431 pinion is a 31-tooth, 64-pitch unit intended as an RC motor pinion replacement. The ultra-hard treatment creates a hardened surface that helps extend service life while maintaining precise tooth profile for reliable mesh under normal RC loads.

Fit this pinion where a 64-pitch pinion is required, pairing it with a 64-pitch spur gear. Always confirm tooth count, bore diameter and shaft fit before installation. Do not force parts; correct alignment reduces premature wear.

Installation guidance: mount the pinion perpendicular to the motor shaft, secure it with the original set screw or keyed retainer, and set correct gear mesh using a feeler or thin paper to avoid binding or excessive backlash. After an initial run, recheck set screw tightness and smooth rotation.

Tuning role: changing pinion tooth count alters final drive ratio and motor load. A 31T pinion will shift RPM relative to other sizes depending on spur gear; make incremental changes when tuning for acceleration, top speed or motor temperature control, and monitor drivetrain noise and motor temperature after any change.